a9229043e3
This prepares for splitting RtpSenderEgress out of RTPSender. For context, see: https://webrtc-review.googlesource.com/c/src/+/158020 Bug: webrtc:11036 Change-Id: I6d385ba255ce23f4c6685a3737eeb243ce2ec6ff Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158201 Reviewed-by: Sebastian Jansson <srte@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29601}